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Mr. Gilbert F. Rindahl - 2 - ay 1, 1985 <br />reclamation plan show an extraction pond stra dling the <br />river channel. This activity is not consista t with the <br />200' setback described in your application. <br />An excavation located in the channel will act as a <br />sediment trap, thus possibly causing accelera ed stream <br />channel erosion downstream. It is further po sible that <br />excavation at the stated location may cause u desirable <br />rerouting of the channel, thus creating unexp cted <br />damage to the County Road. Additionally, the pond area <br />will fill with sediment in a relatively short period of <br />time, thus defeating the stated purpose of fl od control. <br />Please provide details as to how the operator will <br />guarantee that thi~~s//pit area will have no det imental <br />hydrologic or georAaTphologic impacts to upstre m and <br />downstream locations. Please, also provide a pre-mining <br />and post-mining cross-section for the locatiol discussed <br />above. <br />The Division is also requesting verification hat <br />operations within the perennial channel of th Big <br />Thompson River do not require a 404 dredge/fi 1 permit. <br />3. The application indicates the development of ~ ponds as <br />a result of mining and the map shows 5. Plea e clarify. <br />4. Please verify that grading will occur to crea~e 3H:V <br />slopes from 10 feet below the projected low w ter level <br />and 5 feet above the projected high water lev 1. <br />Please forward the publication and notification requirements at your earliest <br />convenience. Thank you for you continued cooperation. <br />Sincerely <br />Da Berry <br />Reclamation, cialist <br />DB/ddt <br />0005E <br />